PXS20RM Datasheet, PDF (1124/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Nexus Crossbar Slave Port Data Trace Module (NXSS) [cut2/3 only]
3
2
1
WPHIT (XXXX)
SRC
TCODE (001111)
MSB
4 bits
4 bits
6 bits
LSB
Fixed length = 14 bits
Figure 33-14. Watchpoint message format
Table 33-13. Watchpoint source description (WPHIT field descriptor)
Watchpoint Source (4 bits)
XXX1
XX1X
X1XX
1XXX
Watchpoint Description
Reserved
Reserved
Internal Watchpoint #1 (BWA1 match)
Internal Watchpoint #2 (BWA2 match)
33.7.2 Watchpoint error message
An error message occurs when a new message cannot be queued due to the message queue being full. The
FIFO discards messages until it has completely emptied the queue. After it is emptied, an error message is
queued. The error encoding indicates which types of messages attempted to be queued while the FIFO was
being emptied.
If only a watchpoint message attempts to enter the queue while it is being emptied, the error message
incorporates the watchpoint only error encoding (00110). If a data trace message also attempts to enter the
queue while it is being emptied, the error message incorporates error encoding (01000).
Error information is messaged out in the following format (refer to Figure 33-15).
3
2
1
ECODE (00110 / 01000)
MSB
5 bits
Fixed length = 15 bits
SRC
4 bits
TCODE (001000)
6 bits LSB
Figure 33-15. Error message format
33-16
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor